Modern Welsh can be written in several levels of formality, for example Colloquial or Literary.[1][2] The grammar described on this page is for Colloquial Welsh, which is used for speech and informal writing. Literary Welsh is closer to the form of Welsh used in the William Morgan's 1588 translation of the Bible and can be seen in formal writing and does not reflect the spoken language presented here.

Initial consonant mutation is a phenomenon common to all Insular Celtic languages, although there is no evidence of it in the ancient Continental Celtic languages of the early first millennium. The first consonant of a word in Welsh may change when preceded by certain words (e.g. i, yn, and a), or because of some other grammatical context (such as when the grammatical object directly follows the grammatical subject). Welsh has three mutations: the soft mutation, the nasal mutation, and the aspirate mutation. These are also represented in writing:

The mutation ts → j reflects a change heard in modern words borrowed from English. Borrowed words like tsips (chips) can often be heard in Wales and the mutated form jips is also common. Dw i'n mynd i gael tsips (I'm going to get (some) chips); Mae gen i jips (I have chips). Despite this the 'ts' → 'j' mutation is not usually included the classic list of Welsh mutations and is rarely taught in formal classes. Nevertheless, it is a part of the colloquial language and is used by native, first-language speakers.

The word for "stone" is carreg, but "the stone" is y garreg (soft mutation), "my stone" is fy ngharreg (nasal mutation) and "her stone" is ei charreg (aspirate mutation). These examples represent usage in the standard language; there is some regional and idiolectal variation in colloquial usage. In particular, the soft mutation is often used where nasal or aspirate mutation might be expected on the basis of these examples.[3]

Mutation is not triggered by the form of the preceding word; the meaning and grammatical function of the word are also relevant. For example, while yn meaning "in" triggers nasal mutation, homonyms of yn do not. For example:

The soft mutation (Welsh: treiglad meddal) is by far the most common mutation in Welsh. When words undergo soft mutation, the general pattern is that unvoiced plosives become voiced plosives, and voiced plosives become fricatives or disappear; some fricatives also change, and the full list is shown in the above table.

In some cases a limited soft mutation takes place. This differs from the full soft mutation in that words beginning with rh and ll do not mutate.

Common situations where the limited soft mutation occurs are as follows – note that this list is by no means exhaustive.

Feminine singular nouns with the definite article or the number one (un).

Nouns or adjectives used predicatively or adverbially after yn.

Adjectives following mor ("so"), rhy ("too") or pur ("fairly, very").

Common situations where the full soft mutation occurs are as follows – note that this list is by no means exhaustive:

An object immediately following the subject (typically after conjugated verbs).

The second element in many compound words, i.e. Llanfair from llan ('parish') + Mair ('Mary').

Verb infinitives following an indirect object, i.e. rhaid i mi fynd ('it is necessary to me to go').

Inflected verbs in the interrogative and negative (also frequently, in the spoken language, the affirmative), though this should strictly be the 'mixed mutation'.

The occurrence of the soft mutation often obscures the origin of placenames to non-Welsh-speaking visitors. For example, Llanfair is the church of Mair (Mary), and Pontardawe is the bridge on the Tawe.

2. In words beginning with an-, the n is dropped before the mutated consonant (except if the resultant mutation allows for a double n), e.g. an + personol → amhersonol (although it would be retained before a non-mutating consonant, e.g. an + sicr → ansicr).

3. In some dialects the soft mutation is often substituted after yn giving forms like yn Gaerdydd for "in Cardiff", or it is even lost altogether, especially with place names, giving yn Caerdydd. This would be considered incorrect in formal registers.

Under nasal mutation, voicedstop consonants become nasals, and unvoiced stops become voiceless nasals. A non-standard mutation also occurs in some parts of North Wales where nasal consonants are also unvoiced, e.g. fy mham ("my mother"; standard: fy mam). This may also occur (unlike the ordinary nasal mutation) after ei ("her"): e.g. ei nhain hi ("her grandmother", standard ei nain hi).

Under aspirate mutation (treiglad llaes), unvoiced stops become fricatives. This is represented by the addition of an h after the original initial consonant (c /k/, p, t → chχ, [ph] f, th/θ/), but the resultant forms are pronounced as single phonemes.

for masculine nouns after the number three (tri) – tri physgodyn 'three fish(es)' (< pysgodyn 'fish')

after the number six (chwech, written before a noun as chwe) – chwe phlentyn 'six children' (< plentyn 'child')

Aspirate mutation is the least-used mutation in colloquial Welsh. The only word that it always follows in everyday language is ei ("her") and it is also found in set phrases, e.g. mwy na thebyg ("more than likely"). Its occurrence is unusual in the colloquial Southern phrase dyna pham ("that's why") as dyna causes the soft mutation, not aspirate mutation.

A mixed mutation occurs when negating conjugated verbs. Initial consonants undergo aspirate mutation if subject to it, and soft mutation if not. For example, clywais i ("I heard") and dwedais i ("I said") are negated as chlywais i ddim ("I heard nothing") and ddwedais i ddim ("I said nothing"). In practice, soft mutation is often used even when aspirate mutation would be possible (e.g. glywais i ddim); this reflects the fact that aspirate mutation is in general infrequent in the colloquial language (see above).

Under some circumstances a 'h' is added to the beginning of words that begin with vowels, a process called 'h-prosthesis'. This occurs after the possessive pronouns ei ("her"), ein ("our") and eu ("their"), e.g. oedran ("age"), ei hoedran hi ("her age"). It also occurs with ugain ("twenty") after ar ("on") in the traditional counting system, e.g. un ar hugain ("twenty-one", literally "one on twenty").

Although aspirate mutation also involves the addition of h in spelling, the environments for aspirate mutation and initial h addition do not overlap except for ei ("her").

Welsh has no indefinite article. This means that indefiniteness is implied by the lack of definite article or determiner. The noun cath, therefore, means both 'cat' and 'a cat'.

English has no plural indefinite article proper, but often uses the word 'some' in place of one: compare "I have an apple" and "I have some apples", where the word 'some' is being used as an article because the English language calls for something in this position, compare "I have apples" and "I have some apples", the former is rarely encountered in English. In these types of English sentences, the word 'some' is therefore left untranslated due to there being no concept on an indefinite article in Welsh: mae gen i afalau ('I have [some] apples').

The definite article, which precedes the words it modifies and whose usage differs little from that of English, has the forms y, yr, and ’r. The rules governing their usage are:

When the previous word ends in a vowel, regardless of the quality of the word following, ’r is used, e.g. mae'r gath tu allan ("the cat is outside"). This rule takes precedence over the other two.

When the word begins with a vowel, yr is used, e.g. yr ardd ("the garden").

In all other places, y is used, e.g. y bachgen ("the boy").

The article triggers the soft mutation when it is used with feminine singular nouns, e.g. tywysoges "(a) princess" but y dywysoges ("the princess").

The definite article is used in Welsh where it would not be used in English in the following ways:

To not allow a noun to be indefinite. In an English sentence like I'm going to school, the noun school has no article, but the listener is expected to know which school is being talked about. In Welsh this noun (ysgol) would take the definite article: dw i'n mynd i'r ysgol ('I'm going to school').

With demonstratives like this and that, which in Welsh are phrases equivalent to English the... here (this) and the... there (that), e.g. y bore 'ma (this morning); y gadair 'na (that chair).

In certain places where English uses an indefinite article. English phrases like one pound per kilogram / one pound a kilogram replace the indefinite article with the definite article, e.g. un bunt y cilogram.

In genitive constructions. English can again get away with no article in these phrases, e.g. Town Hall, City Centre. In Welsh these call for use of the definite article, e.g. Neuadd y Dref (Town Hall, lit. "hall of the town"); Canol y Ddinas (City Centre, lit. "centre of the city").

As in most other Indo-European languages, all nouns belong to a certain grammatical gender; the genders in Welsh are masculine and feminine. A noun's gender usually conforms to its referent's natural gender when it has one (e.g. mam "mother" is feminine), but otherwise there are no major patterns (except that, as in many languages, certain noun terminations show a consistent gender, as sometimes do nouns referring to certain classes of thing, e.g. all months of the year in Welsh are masculine) and gender must simply be learnt.

Welsh has two systems of grammatical number. Singular/plural nouns correspond to the singular/plural number system of English, although unlike English, Welsh noun plurals are unpredictable and formed in several ways. Most nouns form the plural with an ending (usually -au), e.g. tad and tadau. Others form the plural through vowel change, e.g. bachgen and bechgyn. Still others form their plurals through some combination of the two, e.g. chwaer and chwiorydd.

The other system of number is the singulative. The nouns in this system form the singular by adding the suffix -yn (for masculine nouns) or -en (for feminine nouns) to the plural. Most nouns which belong in this system are frequently found in groups, for example, plant "children" and plentyn "a child", or coed "trees" and coeden "a tree". In dictionaries, the plural is often given first.

Adjectives normally follow the noun they qualify, while a few, such as hen, pob, annwyl, and holl ("old", "every", "dear", "whole") precede it. For the most part, adjectives are uninflected, though there are a few with distinct masculine/feminine or singular/plural forms. After feminine singular nouns, adjectives receive the soft mutation.

Adjective comparison in Welsh is fairly similar to the English system. Adjectives with one or two syllables receive the endings -ach "-er" and -a(f) "-est", which change final b, d, g into p, t, c by provection, e. g. teg "fair", tecach "fairer", teca(f) "fairest". Adjectives with two or more syllables use the words mwy "more" and mwya "most", e. g. teimladwy "sensitive", mwy teimladwy "more sensitive", mwya teimladwy "most sensitive". Adjectives with two syllables can go either way.
There is an additional degree of comparison, the equative, meaning "as ... as ...".

The possessive adjective fy is most often heard as 'yn or 'y followed by the mutated noun. For example, bara ('bread') would likely be heard as 'y mara ('my bread').

The demonstrative adjectives are yma "this"' and yna "that" (this usage derives from their original function as adverbs meaning "here" and "there" respectively). When used in this context they are almost always shortened to 'ma and 'na. They follow the noun they qualify, which also takes the article. For example, y llyfr "the book", y llyfr 'ma "this book", y llyfr 'na "that book"; literally the book here and the book there.

The Welsh masculine-feminine gender distinction is reflected in the pronouns. There is, consequently, no word corresponding to English "it", and the choice of e/o (south and north Welsh respectively) or hi depends on the grammatical gender of the antecedent.

The English dummy or expletive "it" construction in phrases like "it's raining" or "it was cold last night" also exists in Welsh and other Indo-European languages like French, German, and Dutch, but not in Italian, Spanish, Portuguese, Indo-Aryan or Slavic languages. Unlike other masculine-feminine languages, which often default to the masculine pronoun in the construction, Welsh uses the feminine singular hi, thus producing sentences like:

Third-person masculine singular forms o and fo are heard in North Wales, while e and fe are heard in South Wales.

The pronoun forms i, e, and o are used as subjects after a verb. In the inflected future of the verbs mynd, gwneud, dod, and cael, first-person singular constructions like do fi may be heard. I, e, and o are also used as objects with compound prepositions, for example o flaen o 'in front of him'. Fi, fe, and fo are used after conjunctions and non-inflected prepositions, and also as the object of an inflected verb:

Weloch chi fo dros y penwythnos?

Did you see him over the weekend?

Fe and fo exclusively are used as subjects with the inflected conditional:

Dylai fe brynu un newydd i ti.

He ought to buy you a new one.

Both i, e, and o and fi, fe, and fo are heard with inflected prepositions, as objects of verbal nouns, and also as following pronouns with their respective possessive adjectives:

Wyt ti wedi ei weld e/fe heddiw?

Have you seen him today?

Alla i ddim dod o hyd i fy allweddi i/fi.

I can't find my keys.

The use of first-person singular mi is limited in the spoken language, appearing in i mi "to/for me" or as the subject with the verb ddaru, used in a preterite construction.

Ti is found most often as the second-person singular pronoun, however di is used as the subject of inflected future forms, as a reinforcement in the imperative, and as following pronoun to the possessive adjective dy ... "your ..."

Chi, in addition to serving as the second-person plural pronoun, is also used as a singular in formal situations, as is in French and Russian. Conversely, ti can be said to be limited to the informal singular, such as when speaking with a family member, a friend, or a child. This usage corresponds closely to the practice in other European languages. A third form, used almost exclusively in the language's northern varieties, is chdi, which has a value close to ti;[4][5] as an independent pronoun it occurs especially frequently after a vowel sound at the end of the phrase (e.g. efo chdi, i chdi, wela i chdi, dyna chdi).[4]

The reflexive pronouns are formed with the possessive adjective followed by hun "self". There is variation between North and South forms. The first person singular possessive pronoun fy is usually pronounced as if spelt y(n).

Singular

Plural

North

First Person

fy hun

ein hun

Second Person

dy hun

eich hun

Third Person

ei hun

eu hun

South

First Person

fy hunan

ein hunain

Second Person

dy hunan

eich hunain, eich hunan

Third Person

ei hunan

eu hunain

Note that there is no gender distinction in the third person singular.

This section needs expansion. You can help by adding to it.(December 2017)

Welsh has special emphatic forms of the personal pronouns.

The term 'emphatic pronoun' is in fact misleading since they do not necessarily indicate emphasis. They are perhaps more correctly termed 'connective or distinctive pronouns' since they are used to indicate a connection between or distinction from another nominal element. Full contextual information is necessary to interpret their function in any given sentence.

Less formal variants are given in brackets. Mutation may also, naturally, affect the forms of these pronouns (e.g. minnau may be mutated to finnau)

Singular

Plural

First Person

minnau, innau

ninnau

Second Person

tithau

chithau

Third Person

Masculine

yntau (fyntau)

hwythau (nhwythau)

Feminine

hithau

The emphatic pronouns can be used with possessive adjectives in the same way as the simple pronouns are used (with the added function of distinction or connection).

In Colloquial Welsh, the majority of tenses make use of an auxiliary verb, usually bod "to be" or gwneud. The conjugation of bod is dealt with in Irregular Verbs below.

There are four periphrastic tenses in Colloquial Welsh which make use of bod: present, imperfect, future, and conditional. The preterite, future, and conditional tenses have a number of periphrastic constructions, but Welsh also maintains inflected forms of these tenses, demonstrated here with talu 'pay'.

Singular

Plural

Preterite

First Person

talais

talon

Second Person

talaist

taloch

Third Person

talodd

talon

Future

First Person

talaf

talwn

Second Person

tali

talwch

Third Person

talith

talan

Conditional

First Person

talwn

talen

Second Person

talet

talech

Third Person

talai

talen

Notes on the preterite:

First and second singular forms may in less formal registers be written as tales and talest, though there is no difference in pronunciation since there is a basic rule of pronunciation that unstressed final syllables alter the pronunciation of the /ai/ diphthong.

Word-final -f is rarely heard in Welsh. Thus verbal forms in -af will be pronounced as if they ended in /a/ and they may be written thus in lower registers.

In some parts of Wales -s- may be inserted between the stem and plural forms.

In parts of South Wales forms like talws are heard for talodd.

Notes on the future:

di is used instead of ti, thus tali di, not *tali ti.

Forms like taliff may appear instead of talith in some southern parts of Wales.

Note that the future was formerly also used as an inflected present. A small amount of frozen forms use the future forms as a present habitual: mi godaf i am ddeg o'r gloch bob bore - I get up at ten o' clock every morning

Notes on the conditional:

-s- may be inserted between the stem and endings.

In the preterite, questions are formed with the soft mutation on the verb, though increasingly the soft mutation is being used in all situations. Negative forms are expressed with ddim after the pronoun and the mixed mutation, though here the soft mutation is taking over (dales i ddim for thales i ddim).

Bod 'to be' is highly irregular. In addition to having inflected forms of the preterite, future, and conditional, it also maintains inflected present and imperfect forms which are used frequently as auxiliaries with other verbs. Bod also distinguishes between affirmative, interrogative, and negative statements for each tense.

The present tense in particular shows a split between the North and the South. Though the situation is undoubtedly more complicated, King (2003) notes the following variations in the present tense as spoken (not as written according to the standard orthography):

Affirmative (I am)

Interrogative (Am I?)

Negative (I am not)

Singular

Plural

Singular

Plural

Singular

Plural

North

First Person

dw

dan

ydw?

ydan?

(dy)dw

(dy)dan

Second Person

—, (r)wyt

dach

wyt?

(y)dach?

dwyt

(dy)dach

Third Person

mae

maen

ydy?

ydyn?

dydy

dydyn

South

First Person

rw, w

ŷn, —

ydw?

ŷn?

(d)w

ŷn

Second Person

—, (r)wyt

ych

wyt?

ych?

—

(ych)

Third Person

mae

maen

ydy?, yw?

ŷn?

dyw

ŷn

Affirmative (I am)

Interrogative (Am I?)

Negative (I am not)

Singular

Plural

Singular

Plural

Singular

Plural

Preterite

First Person

bues

buon

fues?

fuon?

fues

fuon

Second Person

buest

buoch

fuest?

fuoch?

fuest

fuoch

Third Person

buodd

buon

fuodd?

fuon?

fuodd

fuon

Imperfect

First Person

roeddwn

roedden

oeddwn?

oedden?

doeddwn

doedden

Second Person

roeddet

roeddech

oeddet?

oeddech?

doeddet

doeddech

Third Person

roedd

roeddyn

oedd?

oeddyn?

doedd

doeddyn

Future

First Person

bydda

byddwn

fydda?

fyddwn?

fydda

fyddwn

Second Person

byddi

byddwch

fyddi?

fyddwch?

fyddi

fyddwch

Third Person

bydd

byddan

fydd?

fyddan?

fydd

fyddan

Bod also has a conditional, for which there are two stems:

Affirmative

Interrogative

Negative

Singular

Plural

Singular

Plural

Singular

Plural

bydd-

First Person

byddwn

bydden

fyddwn?

fydden?

fyddwn

fydden

Second Person

byddet

byddech

fyddet?

fyddech?

fyddet

fyddech

Third Person

byddai

bydden

fyddai?

fydden?

fyddai

fydden

bas-

First Person

baswn

basen

faswn?

fasen?

faswn

fasen

Second Person

baset

basech

faset?

fasech?

faset

fasech

Third Person

basai

basen

fasai?

fasen?

fasai

fasen

ddim ("not") is added after the subject for negative forms of bod.

There are many dialectal variations of this verb.

Colloquially the imperfect tense forms are o'n i, o't ti, oedd e/hi, o'n ni, o'ch chi and o'n nhw. These are used for the declarative, interrogative and negative.

In speech the future and conditional forms often receive the soft mutation in all situations.

Welsh and other Celtic languages are unusual among the European languages in having no fixed words for "yes" and "no" (although many speakers do use 'ie' and 'na' in ways that mimic English usage). If a question has a verb at its head, the relevant part of that verb is used in the answer e.g.: Ydych chi'n hoffi coffi? (Are you liking coffee? = Do you like coffee?) then either Ydw (I am = I do = Yes) or Nac ydw (I am not = I do not = No)

A few verbs which have bod in the verbnoun display certain irregular characteristics of bod itself. Gwybod is the most irregular of these. It has preterite and conditional forms, which are often used with present and imperfect meaning, respectively. The present is conjugated irregularly:

Singular

Plural

First Person

gwn

gwyddon

Second Person

gwyddost

gwyddoch

Third Person

gŵyr

gwyddon

The common phrase dwn i ddim "I don't know" uses a special negative form of the first person present. The initial d- in this form originates in the negative particle nid: nid wn i > nid wn i ddim > dwn i ddim. Such a development is restricted to a very small set of verb forms, principally this form of gwybod and various forms of bod (e.g., does, doedd, from nid oes and nid oedd respectively)."

The four verbs mynd "to go", gwneud "to do", cael "to get", and dod "to come" are all irregular in similar ways.

mynd

gwneud

cael

dod

Singular

Plural

Singular

Plural

Singular

Plural

Singular

Plural

Preterite

First Person

es

aethon

wnes

wnaethon

ces

caethon

des

daethon

Second Person

est

aethoch

wnest

wnaethoch

cest

caethoch

dest

daethoch

Third Person

aeth

aethon

wnaeth

wnaethon

caeth

caethon

daeth

daethon

Future

First Person

a

awn

na

nawn

ca

cawn

do

down

Second Person

ei

ewch

nei

newch

cei

cewch

doi

dewch

Third Person

eith

ân

neith

nân

ceith

cân

daw

dôn

The forms caeth, caethon, caethoch often appear as cafodd, cawson, cawsoch in writing, and in places in Wales these are also heard in speech.

In the conditional, there is considerable variation between the North and South forms of these four irregular verbs. That is partly because the North form corresponds to the Middle Welsh (and Literary Welsh) imperfect indicative, while the South form corresponds to the Middle Welsh (and Literary Welsh) imperfect subjunctive.

^King, Gareth (2015). Modern Welsh: A Comprehensive Grammar. Taylor & Francis. p. 2. ISBN978-1-317-57670-9.: "A distinction must first be made between the Colloquial (or Spoken) Welsh in this grammar and Literary Welsh. The difference between these two is much greater than between the virtually identical colloquial and literary forms of English - so great, in fact, that there are good grounds for regarding them as separate languages."

^For a complete treatment of literary Welsh, see A Grammar of Welsh (1980) by Stephen J. Williams